<template>
    <el-container class="home-container">
        <el-header>
            <div>
                <img src="../assets/heima.png" alt="">
                <span>电商后台管理系统</span>
            </div>
            <el-button type="info" @click="logout">退出</el-button>
        </el-header>
        <!-- 页面主体区域 -->
        <el-container>
            <!-- 侧边栏 -->
            <el-aside :width="isCollapse ?'64px':'200px'">
                <div class="toggle-button" v-on:click="toggleCollapse()">|||</div>
                <!--侧边栏菜单区域 -->
                <el-menu
                    background-color="#333744"
                    text-color="#fff"
                    active-text-color="#409EFF"
                    unique-opened
                    :collapse="isCollapse"
                    :collapse-transition="false"
                    router
                    :default-active="activePath">
                    <!-- 一级菜单 -->
                    <el-submenu :index="item.id + ''"  v-for="item in menulist":key="item.id">
                        <template slot="title">
                            <!-- 图标 -->
                            <i :class="iconsObj[item.id]"></i>
                            <!-- 文本 -->
                            <span>{{item.authName}}</span>
                        </template>
                        <!-- 二级菜单 -->
                        <el-menu-item :index="'/'+subItem.path" v-for="subItem in item.children"
                        :key="subItem.id" @click="saveNavState('/'+subItem.path)">
                            <template slot="title">
                                <i class="el-icon-menu"></i>
                                <span>{{subItem.authName}}</span>
                            </template>
                        </el-menu-item>
                    </el-submenu>                 
                </el-menu>
            </el-aside>
            <!-- 右侧内容主体 -->
            <el-main>
                <!-- 路由占位符 -->
                <router-view></router-view>
            </el-main>
        </el-container>
    </el-container>
</template>

<script>
export default {
    data(){
        return{
            //左侧菜单数据
            menulist:[],
            iconsObj:{
                125:'el-icon-user-solid',
                103:'el-icon-question',
                101:'el-icon-shopping-bag-1',
                102:'el-icon-takeaway-box',
                145:'el-icon-data-line'
            },
            //是否折叠
            isCollapse: false,
            //被激活的链接地址
            activePath:''
        } 
    },
    created(){
        this.getMenuList()
        this.activePath = window.sessionStorage.getItem('activePath')
    },
    methods: {
        logout() {
            window.sessionStorage.clear()
            this.$router.push('/login')
        },
        //获取所有菜单
        async getMenuList(){
           const {data:res} = await this.$http.get('menus')
           if(res.meta.status !== 200) return this.$message.error(res.meta.msg)
           this.menulist = res.data
           console.log(res)
        },
        //点击按钮，切换菜单的折叠和展开
        toggleCollapse(){
            this.isCollapse = !this.isCollapse
        },
        //保存链接的激活状态
        saveNavState(activePath){
            window.sessionStorage.setItem('activePath',activePath)
            this.activePath = activePath
        }
    }
}
</script>

<style scoped>
.home-container{
    height: 100%;
}
.el-header{
    background: #373d41;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-left: 0px;
    color: #fff;
    font-size: 20px;
}
.el-header div{
    display: flex;
    align-items: center; 
}
.el-header div span{
    margin-left: 15px;
}
.el-aside{
    background: #333744;
}
.el-aside .el-menu{
    border-right: none;
}
.el-main{
    background: #eaedf1;
}
.toggle-button{
    background-color: #4A5064;
    text-align: center;
    font-size: 10px;
    line-height: 24px;
    color: #fff;
    letter-spacing: 0.2em;
    cursor: pointer;
}
</style>
